[haiku-development] Re: Boot screen icons
- From: Ingo Weinhold <ingo_weinhold@xxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Sat, 08 Nov 2008 18:47:46 +0100
On 2008-11-08 at 09:16:07 [+0100], Humdinger <humdingerb@xxxxxxxxxxxxxx> wrote:
> Axel Dörfler wrote:
> > They are actually named, see:
> > http://dev.haiku-os.org/browser/haiku/trunk/headers/private/kernel/boot_splash.h
> >
> > When BOOT_SPLASH_STAGE_1_INIT_MODULES lits up (the first one), the
> > kernel core services are already fully initialized and up and running.
> > If you need explanations somewhere, please ask.
>
> OK, coming back to this, would you say the following is accurate? Apart
> from stage 2
> "BOOTSTRAP_FS", where "loading kernel is probably wrong"...
>
> STAGE_1_INIT_MODULES = 0,
> Atom - Initializing modules.
>
> STAGE_2_BOOTSTRAP_FS,
> Disk with magnifying glass - Loading kernel.
Nope, the kernel has already been loaded before stage 1. In this phase the root
file system is created ("/"), the devfs mounted ("/dev"), and a few symlinks in
the
rootfs are created. The devices entries itself aren't available yet. IMHO this
activity doesn't really deserve a separate icon, since it's only a matter of a
few
microseconds.
> STAGE_3_INIT_DEVICES,
> Plug-in card - Initializing devices.
Initializes the device manager. The devices themselves are mostly lazily
initialized when first accessed.
> STAGE_4_MOUNT_BOOT_FS,
> Boot disk - Mounting boot disk.
>
> STAGE_5_INIT_CPU_MODULES,
> Chip - Initializing CPUs.
This just loads the CPU module responsible for this CPU brand/family/model,
which
allows access to specific features (like setting the MTRR (memory type range
registers)) and provides optimized versions of certain functions (or would do
that,
if someone wrote them).
> STAGE_6_INIT_VM_MODULES,
> Folder - Initializing virtual memory.
Not really -- the VM is up before stage one and swap support is initialized in
phase four (as soon as the swap file can be accessed). Various subsystems do
final
initializations that potentially require modules to be loaded from the boot
disk.
CU, Ingo
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